Update ignore directories

setup.sh

@@ -81,6 +81,17 @@ mount -o $linux_root_mntopts $linux_root /mnt
   btrfs subvolume create root
   btrfs subvolume set-default `btrfs subvol list -p . | cut -d' ' -f2` .
   btrfs subvolume create root/home
+
+  # set the directories not to be backed up
+  mkdir -p ./root/{home/${USERNAME},opt,usr,var/{,lib}}
+  btrfs subvolume create root/home/${USERNAME}/x # user's temporary directory
+  btrfs subvolume create root/home/${USERNAME}/.cache
+  btrfs subvolume create root/opt
+  btrfs subvolume create root/usr
+  btrfs subvolume create root/var/cache
+  btrfs subvolume create root/var/db
+  btrfs subvolume create root/var/lib/docker
+  btrfs subvolume create root/var/log
 )
 umount /mnt
 
@@ -207,20 +218,4 @@ $CHROOT bash -c "
   sed -i -e '\$d' /etc/sudoers
 "
 
-# set the directories not to be backed up
-
-mount -o $linux_root_mntopts $linux_root /mnt
-(
-  cd /mnt
-  btrfs subvolume create root/home/${USERNAME}/x # user's temporary directory
-  btrfs subvolume create root/home/${USERNAME}/.cache
-  btrfs subvolume create root/opt
-  btrfs subvolume create root/usr
-  btrfs subvolume create root/var/cache
-  btrfs subvolume create root/var/db
-  btrfs subvolume create root/var/lib/docker
-  btrfs subvolume create root/var/log
-)
-umount /mnt
-
 set +x